Collapsible smokestack



Dec. 1,5, 1942', s. McRAY f 2,305,181

.coLLAPsIBLE SMOKE STACK ATTORNEY Dec. 15, 1942. G, MccRAY 2,305,181

coLLAPsILE SMOKE STACK A Filed oct.' so, .1.959 2 sheets-sheet 2 ATTORNVEY Patented Dec. 15, '1942 y 2,305,1si

COLLAPSIBLESMOKESTACK George McCray, Alvin, Tex. i

Application October 30, 1939, SeriallNm 301,987`

(Cl. 11G-184)' 3 Claims.

My invention relates to smoke stacks, and more particularly to smoke stacks for portable boilers such as are commonly used in oil fields.

The prime object of the invention is to provide a sectional stack which may be easily and quickly collapsed when it is desired to move the boiler, and the sections of which can be moved to their extended positions with similar ease and speed.

Another object is to provide, ina telescoping stack, a novel means for rigidly locking the stack sections in their extended positions.

A further object is to provide a novel interengaging stack: section structure for properly aligning the stack sections during their independent movement with relation to each other.

A further object is to provide an interengaging means for the stack sections whereby leakage of smoke between the sections is eliminated.

Other objects of the invention will be apparent from the following description of the accompanying two-sheet drawings wherein:

Figure 1 is a side elevational view of a collapsible stack made in accordance with the present invention; the stack sections being shown in their extended positions;

Figure 2 is a front elevational view, partially in section, of a boiler equipped with the collapsible stack, the stack sections being shown in their telescoped positions;

Figure 3 is a fragmentary vertical sectional view detailing the typical construction of the interengaging ends of two of the stack sections;

Figure 4 is a fragmentary elevational view of the interengaging ends of two of the stack sections, and detailing the preferred guiding means and preferred locking means;

Figure 5 is a horizontal sectional view taken substantially along the line 5-5 of Fig. l; and,

Figure 6 is a horizontal sectional view taken substantially along the line 6-6 of Fig. 1.

Like characters of reference designate like parts in all of the gures.

In the drawings:

The reference numeral I indicates, as a whole, a conventional boiler having a suitable tubular transition piece 2 rigidly connected thereto by any suitable detents 3. The transition piece 2 is common to usual boiler construction and supports an upstanding tubular stack section 4 which is either integral with or is rigidly attached to the transition piece 2. To the exterior of the upper end of the lower stack section 4 is welded or otherwise rigidly attached an encircling ring member 5 which has an inwardly projecting' flange 6 and an outwardly projecting ange 1,

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Slidably disposed within-the lower stack section'll Ais a smaller stack section 8 whichis slightly less in outside diameter than the inside diameterv of the inwardly projecting flange 6 of the ringv member 5 on the section 4. The section 8 has a rigid outwardly projecting annular flange 9 carried by its lower end, and as best shown in Fig. 3, this flange 9 is adapted to t snugly against the nether surface of the flange 6 of the ring 5 when the stack section 8 is in a fully upwardly extended position. Exteriorly, the section 8 has a plurality of longitudinally extending rigidly mounted ribs I0 which are radially spaced therearound, and which slide within similarly spaced vertical slots I I in the ring member 5 of the lower stack section 4. Adjacent the lower end of each of the ribs I6, there is provided a transverse abrupt ended notch I2 adapted for receiving a wedge-shaped key I3 when the section 8 is fully extended. The keys I3 when inserted in the notches I2 rest upon the upper surface of the ring member 5, and thus prevent downward movement of the stack section 8 within the section 4, and chains I4 prevent loss of the keys I3.

The meeting .and interengaging structures of the adjacent ends of the two sta-ck sections 4 and 8 are typical of the adjacent ends of the stack section and a smaller stack section I5 therein, and it is therefore 'thought unnecessary to again describe such structure in its application to the upper end of section 8 and the lower end of the section I5. The stack section I5 is, of course, equipped with the radially spaced longitudinally extending ribs I0.

The upper end of the stack section I5 has a rigidly mounted annulus I6 which projects outwardly therefrom in the form of a flange, and this annulus is provided with a plurality of radially spaced through perforations for receiving the upper ends of a like plurality of stay-rods I1. The stay-rods I'I extend downwardly through radially spaced slots I8 in the periphery of the ring member 5 of the lower stack section 4 (Fig. 5). Nuts I9 act to fasten the stay-rods to the annular elements 5 and i6. The ring member 5 carried by the upper end of the stack section 8 is also provided with a series of the notches I8 so that the stay-rods I1 may pass therethrough.

The upper annulus I6 is equipped with a suitable pivotally mounted bail 26 whereby the stack sections I5 and 8 may be raised or lowered by conventional hoisting tackle, not shown. In order to facilitate the work of extending or-collapsing the stack sections, the lower section 4 is provided with suitable annular platforms l2I for workmen, one of the platforms is best illustrated in Fig. 6 of the drawings.

It is thought that operation of the device will be obvious to those versed in the art, and that it may readily be seen that a collapsible stack has been provided which may be conveniently lowered, raised, and locked in extended position. Also, that the flanges 6 and 9 prevent escape of smoke between the sections, and that the stack sections are properly strengthened and braced by the ribs I0 and stay-rods I1 so that they will remain in rigidly extended positions.

Obviously more or less than three of the stac sections may be provided if desired.

I claim:

l. In a stack: telescoping sections; anannulus carried by an outer stack section having in= wardly presented radially spaced slots; longitudinally extending outwardly projecting ribs car.-

ried by an inner stack section, said ribs slidably disposed within said slots; and means engaging the ribs and the annulus for holding the sections against longitudinal movement with relation to each other.

2. In a stack: telescoping sections; an annulus carried by one stack section having radially spaced slots therein; longitudinally extending ribs carried by another section and slidably engaged within said slots, each of the ribs being provided with an opening located adjacent the annulus when the ribbed section is in its extended position with relation to the section carrying the annulus; and keys insertable through said openings and bearing on said annulus for holding the sections against independent longitudinal movement.

,3. In a stack: telescoping sections; an annulus carried by an outer section having inwardly presented radially spaced slots; longitudinally extending ribs carried by an inner section, said ribsA slidably disposed within said slots, each of the ribs'having an opening therein located adjacent the annulus when the inner section is in its extended position; and keys insertable through the openings for holding the inner section against independent longitudinal movement.

GEORGE MCCRAY. 

